/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.calcite.server;

import org.apache.calcite.jdbc.CalcitePrepare;
import org.apache.calcite.sql.SqlNode;

/**
 * Executes DDL commands.
 */
public interface DdlExecutor {
  /** DDL executor that cannot handle any DDL. */
  DdlExecutor USELESS = (context, node) -> {
    throw new UnsupportedOperationException("DDL not supported: " + node);
  };

  /** Executes a DDL statement.
   *
   * <p>The statement identified itself as DDL in the
   * {@link org.apache.calcite.jdbc.CalcitePrepare.ParseResult#kind} field. */
  void executeDdl(CalcitePrepare.Context context, SqlNode node);
}
